Speed-changing device for engines.



E. H. SCHROEDER.

SPEED CHANGING DEVICE FOR ENGINES.

' APPLICATION FILED DEC-3,1913.

1,14,387. Patented May 23, 1916.

fly! 5 1% E O as If E I x 15 1 if 0 if EDWARD H. SCHROEDER, OF "WAVERLY, IOWA.

SPEED-CHANGING DEVICE FOR ENGINES.

Specification of Letters Patent.

Fatented llliay 23, 1916.

Application filed December 3, 1913. Serial No. 804,443.

To all whom it may concern:

Be it known that I, EDWARD H. Sermon- DER, a citizen of the United States, residing at WVaverly, in the county of Bremer, State of Iowa, have invented certain new and useful Improvements in Speed-Changing Devices for Engines; and I do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art towhich it appertains to make and use the same.

This invention relates to engines and has special reference to a speed adjusting device adapted to be used in connection with the governor mechanism of a gas engine, the governor controlling the exhaust valve by holding said valve open when the speed rises above that for which the governor is set. A

The principal object of the present invention is to provide a novel and improved means to quickly adjust the governor mechanism so that the maximum speed may be raised or lowered at the will of the operator.

With the above and other objects in view the invention consists in general of certain novel details of construction and combination of parts hereinafter fully described, illustrated in the accompanying drawings, and specifically claimed.

In the accompanying drawings, like characters of reference indicate like parts in the several views, and Figure 1 is a side elevation, partly in section, of the device as applied to a gas engine. Fig. 2 is an enlarged device, the View partly in section showing the governor and the means for controlling the same. Fig. 3 is a detail view of a por tion of the latch mechanism used herewith.

In carrying out the objects of the invention there is shown, in the present disclosure an engine 10 which is mounted on a suitable base 11. This engine is provided with the usual shaft 12 and on this shaft is fixed a gear 13 which meshes with a gear 14 carried on a hollow spindle 15 which is journaled in a bearing bracket 16. Slidable on the spindle 15 is a plunger 17 carrying a downwardly extending tube 18 which projects below the lower end of the spindle. Fixed upon the spindle 15 is a governor casing 19 and pivotally mounted in this governor casing is pair of bent levers 20 which have their upper ends enlarged as at 21 to increase the weight thereof. The lower ends of these levers project beneath the tube 18 as shown at 22 so that when the upper ends of the levers move outward through centrifugal force the lower ends cause the tube to rise. The plunger 17 has projecting therefrom a stem 23 which passes through the upper end of the plunger and bears against one arm of a bell crank lever 24 which is mounted in a suitable pivot 25 carried by the fixed part of the engine frame. The other arm of this bell. crank lever 24 is provided with an extension 26 having an opening 27 therein. This extension 26 bears against the ordinary linkage 28 which is arranged to control the valve 29 in the manner common to such de-' vices.

Mounted on the base 11 is a bar 30 preferably made of angle iron and extending upward from this bar is a post 31 whereto is pivoted a lever 32. Pivoted to this lever intermediate its ends is a bolt 33 which passes through the opening 27. Surrounding this bolt between the lever 32 and the extension 26 is a coiled spring 34. Extending upward from the bar 30 is a second post 35 carrying on its upper end a notched segment 36 which is concentric with the pivot point of the lever 32. The notches in the segment 36 are of such size as to receive this lever and thus hold the same, the lever 32 being of spring metal and constantly tending, by its own resiliency, to bear against the segment 36. A keeper 37 is provided on the lever for the purpose of preventing the lever being sprung too far away from the segment during adjustment.

In the operation the governor levers 2O tend to cause the sleeve to move upward and thereby to move the lever 21 so that the valve 29 is opened. This causes compression of the spring 34; and the movement is thus resisted by this spring. When the centrifugal force is balanced by the tension of the spring 34 motion of the lever24: ceases and the linkage is held to operate in an adjust ment determined by the balancing of the centrifugal force and spring tension. Now if the lever 32 be moved out of one notch and into another the tension of the spring will be thereby increased or decreased and consequently the balance between said tension and the centrifugal force will be destroyed momentarily and the engine speed will increase or decrease, through readjustment of the linkage, until this balance has again been restored.

It will thus be seen that by properly mat shown and described, but it is wished to include all such as come properly within the scope claimed.

Having thus described the invention, what is claimed as new, is

In a device of the class described, a rock lever, a governor mechanism adapted to 1 move said rock lever in one direction, an exhaust valve, links controlling said exhaust valve and controlled in turn by said rock lever, a spring bearing against the rock lever, a manually operable hand lever pivotally mounted at one end, a bolt pivotally connected to the hand lever intermediate the ends of the latter and extending through an opening in the rock lever and adapted for varying the tension of the spring, the said spring being coiled around the bolt between the hand lever and the rock lever, and a notched segment over which the free end portion of the hand lever works, said hand lever being adapted to engage a selected notch in the segment.

In testimony whereof, I affix my signature, in the presence of two witnesses.

EDWARD H. SCHROEDER.

Witnesses:

F. H. MUNGER, MAE A. Moonn.

Copies of this patent may be obtained for five cents each, by addressing the "Commiuioner of Iatents,

Washington, D. C. 

